CRM stands for Customer Relationship Management it is used for record customer contact no. customer transactions, customer sales purchase history, and detailed customer information for future perspective. In addition to CRM, Open source CRM is free of cost customer relationship management solution. Anyone modify open source CRM according to their needs. No need to buy an expensive commercial CRM solution.

Lets we see the top 3 open source CRM solution in 2016.
EspoCRM
EspoCRM is an open-source Customer Relationship Management (CRM) solution. It is a web-based application and allows you to see, enter and evaluate all your company relationships regardless of the type. It comes with a user-friendly graphical user interface. It is written in PHP and comes with a REST API. It allows you to customize CRM according to your need.

Features of EspoCRM

Provide data import and theme facility.
Provide change layouts for detail and list views.
Users can be organized into teams.
Provide sync target lists with reports.
Provide inventory management of product quotes and invoices.
Provide support of email signature, filters, templates, etc.
Provide support of Google calendar integration.

SuiteCRM
SuiteCRM is an open-source Customer Relationship Management (CRM) solution. It is supported cross-platform and written in PHP language. It is released under the AGPL license. It is a powerful and extensible alternative to traditional proprietary CRM applications such as Salesforce, Oracle, SAP, and Microsoft Dynamics. It consists of multiple modules like the product, quote, Google map, etc.

Features of SuitCRM

It Provides support of integration with Google apps integration, Joomla, Drupal, etc.
Provide support of content management, account management, and forecasting.
Allow customers to log and track their own issues.
Provide streamline and automate repetitive tasks.
Model sales pipeline quickly and easily.
It provides a powerful workflow module.
It provides sales pipeline management.
Excellent customer service portal.

CiviCRM
CiviCRM is an open-source web-based Customer Relationship Management (CRM) solution. It is specifically designed to fulfill the needs of advocacy, non-profit and non-governmental groups. It has the ability to manage the information of members, event registrants, subscribers, grant application seekers, organization donors, and funders. It is written in PHP and supported across platforms. It is released under GNU AGPL 3 license.

Features Of CiviCRM

It allows users to track whatever data they need to identify.
Provide detailed communication preferences.
Provide import and export facility.
Provide support of multiple addresses, email, and phone number fields.
Provide the support of creating your own forms via drag-n-drop.
Provide customization and integration support.
Create entirely new custom reports.